Toothbrush Timer

We are engineering Python code to make a Circuit Playground Express perform 3 different functions, sound, motion, and light. In the end, we will have produced a functional 2-minute timer that can be used for brushing teeth.

Supplies

CPX (Circuit Playground Express)

Computer

USB-C or USB-A

Codes from the Circuit Python website

MU Editor

Continuous servo motor

Alligator clips with wires

3D Printed Design

Hot Glue Gun

Step 1: Overview of Circuit Python

Here is a link to Adafruit's website giving foundational information about our Circuit Python code: Adafruit Website.

Step 2: Plug the CPX Into the Computer

Plug in the CPX using either a USB-A or USB-C cord to your computer.

Step 3: Attach the Servo Motor to the CPX

Using the alligator clips, attach the continuous servo motor to the CPX. Attach the brown wire to GND, the orange wire to A1 and the red wire to VOUT. Please reference the image attached.

Step 4: Upload Code for the Servo Motor

Open up the MU Editor on your computer. Make sure you upload a blank code.py file onto MU Editor. Then open the attached file and copy and paste the entire code into the MU Editor.

Step 5: Upload Code for Lights

Open the attached file, copy the entire code for lights and paste it in the MU Editor below the code for the servo motor.

Step 6: Upload Code for Sound

Open the attached file, copy the entire code for sound and paste it in the MU Editor below the code for lights.

Step 7: Combine the Codes

The attached file consists of the combined codes, because in order for all functions to work simultaneously, we needed to combine the codes in a specific way.

In order to have all codes run at the same time, copy the entire combined code and paste it in a blank code.py file in the MU Editor.

Step 8: Print the 3D Design

Using the following links, print out these 3D designs of the timer. There is no need to use supports when printing.

Base

Bottom

Arrow

Step 9: Assemble the Timer Pt. 1

Once all three codes are uploaded into the MU Editor, hot glue the servo inside the base of the timer through the hole and attach the arrow on top.

Step 10: Assemble the Timer Pt. 2

Insert the wires and the CPX inside of the timer in the same way the image shows above. Make sure the CPX wire connected to the computer goes out the side opening. Then attach the bottom lid to the timer.

Step 11: Save the Design

By pressing the "Save" button on the MU Editor, the timer should start to work!